APPC Subsystem on MPE/XL Node Manager's Guide (30294-90007)

138 Chapter6
Troubleshooting the APPC Subsystem
Startup Problems
• Maximum RU size. The Maximum RU Size (Send and
Receive) configured in the “APPC: Mode Type Data” screen,
must match the maximum RU size configured for the remote LU.
The maximum RU size for LUs on an IBM mainframe is
configured in the
RUSIZES parameter of the MODEENT in the
Logmode Table. The maximum RU size for LUs on an AS/400 is
configured in the MAXLENRU field of the Mode Description.
NOTE Certain values in the remote system configuration must match values
in the HP 3000 configuration file. See Chapter 4 , “APPC Subsystem
Configuration,” in this manual and the SNA Link/XL Node Manager’s
Guide for more information.
3. If the HP 3000 is configured to communicate with an AS/400, make
sure the LCLCTLSSN value is 0 in the Mode Description on the
AS/400. Make sure the LCLCTLSSN value is *NO in the Device
Descriptions for all AS/400 LUs that will communicate with the
HP 3000.
If you have checked your configuration, and the APPC sessions still do
not activate, collect the SNA Transport user interface trace and the
APPC subsystem internal trace, and give them to your HP
representative for analysis. For instruction on turning on APPC
subsystem internal tracing, see the description of the APPCCONTROL
START command, in Chapter 2 , “Interactive Control Operator
Commands,” of this manual. For instructions on turning on SNA
Transport tracing, see the SNA Link/XL Node Manager’s Guide.